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She carries water for Glaceau. Carrie Underwood, who won the American Idol contest in season four, has joined season one winner Kelly Clarkson in the trickle of American Idol winners into endorsements for Vitaminwater, made by Glaceau, which is owned by major Idol sponsor Coca-Cola.

Underwood's debut in a Vitaminwater ad this summer will be a big-screen production, but it won't be a solo performance.

Earlier this month, she joined fellow Glaceau endorsers rapper 50 Cent, baseball pro David Ortiz and basketball phenomenon Dwight Howard to film Vitaminwater's first ad for movie theaters. The celebrities appear as cosmonauts being trained by an inept Russian supervisor. The humorous spot will run on more than 33,000 screens in 5,000 theaters.

Tell them your favorite TV ad. The One Club, a non-profit group that promotes creativity in advertising, wants real people to weigh in with their ...